secretary of state hillary clinton. and we have learned she is getting ready tonight for her long-awaited appearance tomorrow before congress, over the tragedy at the u.s. consulate in benghazi. abc's chief global affairs correspondent martha raddatz has that story. >> reporter: hillary clinton seemed all business yesterday. no heels, no contact lenses, as she held tight to husband bill, carefully navigating the stairs on the way to the ceremony. the secretary did not take the arm of her military escort but the clintons could be heard saying to the escort -- >> just in case. >> reporter: they appreciated that he was there, just in case. >> hello! hey! >> reporter: moments later, she was on her own, all smiles, no sign of any residual effects from that nasty concussion. but tomorrow, returning to capitol hill, her headache may be back, as she faces what could be a brutal day. the long postponed hearing on benghazi and the pent up frustration of some prominent senators who have made it clear they want answers about what w